Effects of Bi addition on sintering and electrical properties of scandia stabilized zirocnia as intermediate-temperature SOFC electrolyte

Masashi Mori, Y. U. Liu, Shuhua Ma, Shin Ichi Hashimoto, Kenji Yasumoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The compatibility of bismuth compounds as a sintering aid for (ZrO 2)0.89(ScO1.5)0.1(CeO 2)0.01 (ScSZ) electrolyte in intermediate-temperature solid oxide fuel cells (IT-SOFCs) has been discussed. Addition of 3 mol% BiO15 considerably decreased the sintering temperature of ScSZ of approximately 200 °C and achieved the densification with a relative density above 95% at 1200°C. The solid solubility limit of BiO1.5 in ScSZ was less than 2 mol%. Dispersion of Bi2O3 at the grain boundaries correspondingly accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450 °C. At elevated temperatures of 450-750 °C, the electrical conductivity of the ScSZ after doping remained almost unchangeable in air and under reducing atmospheres. The results suggested that bismuth addition is promising to be applicable to a low-temperature co-firing fabrication of ScSZ based components for IT-SOFCs.

Original languageEnglish
Pages (from-to)184-189
Number of pages6
JournalElectrochemistry
Volume77
Issue number2
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • Densification
  • Electrolyte
  • Scandia stabilized zirocnia
  • Sintering additions
  • Solid oxide fuel cells

ASJC Scopus subject areas

  • Electrochemistry

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